fix #145 (by JesseRWeigel) scroll fix

on web scrollbar can shortly appear

Author: sodik82

src/MenuPlaceholder.js

@@ -43,5 +43,6 @@ const styles = StyleSheet.create({
     left: 0,
     right: 0,
     bottom: 0,
+    overflowY: 'hidden',
   },
 });